Improvement in producing photographic pictures  upon tbansparenf media



' Be it known that we, JOHN A. WHLPPLE UNITED STATES;

"JOHN A; WHIPPLEAND SVM. t me-or ot? T-IMP'ROVEMENT lN'PRoD UCllilG PHOTOGRAPH-IQ P CT IuRts-fhPoniniwsriAREM-hthu.'

h USETTS,

Specification forming; partot Letters PatcntNo. 7,3158, dated June 1 I I I To all whom it may concern.-

and W. B.- JONES, of Boston, in thecounty-of Sufl'olk and State of Massachusetts, havein ,vented certain Improvements in the Art" of Taking Photographic Pictures; andQwe dohereby' declarehth'at the following is.a full,

clear, and exact description of the principle or character which distinguishes them from -all other things-before known and 0t: the usual manner of making, modifying, and usi'ngixjthe,

The

, lie and alkaline salts, the precipitation of which i "produces? the various picture-to be taken,

stances are to be used in combinationw't chlorine,;iodine, bromine, &c., and them comof 60 to 70 Fahrenheit for tw v, i four fluid ounces of this prepared-aihume a. compound formed by mixin 'of hydriodateof potassaior h of silver, dissolved in one an water, the wholejto bellmi' lades and tints of the,

To enableothersskllled in' the art to use our invention, wewill proceed to describe thepro cess, which is as follows. lllhe bestof plateglass, when" that material is used, is required for our Eurposes. Web

ve used plates'bf mica andother ti ans be taken pared albumenfrom eggs. The above'subponents. When albumen is s it is mgp ed in t lowing" manner: Take thi" eggs, shake or break them, -t v low the fluid partto filter through cloth', w eh istheuf t nsparentfne'gative pictures by the following ocess; Thealbuinen, prepared as above de.

tobe exposed to airhaving-the monia with eleven grains of strongly. Afterfilteriugfth; n] evenlywith it the surface 1 clear. glass, a'nd. at'ter dra U l l nature of 'ourimprovemcnts oousistfin j M coatingthe surface of glass or othersuitable media with a film of matter containing'metal.

- P been.

a. solution containing .j' isi fi we heat the plate and dry the film put into a shallow dish of :SllibliblG'SlZB ceive the glass a fluidformedhygdissblv ing in oneounce of water, addin'g to itthree pennywei ght ofstron g'acetic acid, and place'th'e whole in-a darkened room. We their slide into the liquid the prepared plate, so"that no aircan .mainiuuder the liquid as shorta'time as pos-' :sible 'Wh'ile the plate or" glass is still moist 1 I 7 another plate of; glas's,havinga projecting border near its outer.

we eoyer its coated side with edges to prevent actual contact of, the plates and the evaporation of the liquid; iswuow 'readyto be exposed in the camera in the usual wayfor taking daguerreotypesuntil- 'J'and immersedor washed in a strong solution .coinpou'nd of silver is speedily produced, and the picture appears, and'ca-n be rendered more i and more distinct by continued washing in the solution until the full tint is obtained. It is, then to be rapidly washed in water, followed suliihiteQiishda, until all-ithe unreduced compoundsvorfgsilver have been removed, which own by the shadows becoming clear and nsparent, The picture is then to be inse daud dried. g Who/picture thus produced is negetive, havug the lights dark and opaque and. the shad A ows'clear andtransparen-t; but if laid or pro- 7 ducted-mi a dark, grouiidgthe light is reflected i by the: precipitated silyei, iu.the lights, andthe shadows-are yform-etl liylthefdark groundibehind,1making a ipositive picture of it,

lfositiveieopies can be produced from the ,1 is used to" dissolve common salt in'the crystals of nitrate of silver inone ounce of was fii'ty grains of the crystals ofliitrateiofsilver follow the submerged parts, allowing it-to re- The plate slight traces of the picture can be perceived. The plate is then removed to a darkenedroom of'gall-nuts injwater, by which the organic by immersion in .a saturated solution of hypo- I bp'ortion ofoneounce oftalbumen to one dram fGlassllplatescoated with this com-j pound and dried are to be washed over with 3 one hundred grainsof ter, and allowed to soak therein some minutes. fihhey must refterwardf be slightly washed in water, dried, and kept in a dark place till required for use. lly placing one of these plates behind one of the negative pictures, as before described, with the films in close contact and exposing the two together to the sunlight, carcfullyprotectingthe last plate from all light, except that passing through the negative pietnre, a positive picture is produced. Any number of these copies maybe taken from the same negative picture. The copies are fixed or rendered permanent by usingthe solution of hyposulphite of soda, as before, to remove all unaltered compounds. The colors can be deepened by the use of water aoidulated by sulphuric acid. Instead of a film on glass the or dinary sensitive paper may be used, and'the pictures then resemble talbotypes, except that they are more clearly defined.

' \Vhatwe claim as our invention, and desire to secure by Letters Patent, isl 1. The takdugof photographic pictures upon transparent media by coating them with some suitable vehicle for the sensitive materials,

substantially as set forth.

2. The process of preparing and using the sensitive coating or film upon surfaces, whether of transparent, translucent, or opaque bodies, substantially in the manner andi'or the purposes set forth.

JOHN. A. WH-rrrnn. W WM. B. JONES.

Witnesses:

EMORY TYASIIBURN, O. EAMES. 

